WATERTOWN, Mass.—Massachusetts State Police say a pair of brothers suspected in the Boston Marathon bombings spent the night in a Honda Civic and used it to carjack a Mercedes SUV.

Police said Friday at a Watertown news conference that one of the brothers stayed with the carjacking victim for a few minutes and then let him go.

They say one brother drove away in the Civic, and the other one drove away in the Mercedes.

Police say one then ditched the Civic and reunited with his brother in the Mercedes. Authorities say both suspects were in the Mercedes when they encountered police and hurled explosives at officers. Twenty-six-year-old suspect Tamerlan Tsarnaev (tsahr-NY'-ev) was killed.

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